Questions from Chapter Four.

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    1. What group of elements do Ca, Be, and Mg belong to? Select One Alkali Metal Alkaline Earth Metal Halogen Transition Metal

    2. What group of elements easily gains one electron? Select One Alkali Metal Alkaline Earth Metal Halogen Transition Metal

    3. What are the elements in the first group of the periodic chart called? Select One Alkali Metal Alkaline Earth Metal Halogen Transition Metal

    4. What two atomic properties have an increasing trend as you move across a period? Select Any Two Atomic Radii Ionization Energy Electronegativity Reactivity

    5. How many valance electrons does a fluorine atom have?

    6. Explain how Moseley's arrangement of the elements in the periodic chart was different than Mendeleev's? 

    7. What did the gaps in Mendeleev's periodic chart represent?

    8. All halogens are very reactive. What causes these elements to have similar characteristics?

    9. What is the periodic trend for ionization energy and how does this trend relate to different energy levels?

    10. How does the trend of atomic radii relate to the addition or subtraction of electrons?

    11. Identify which trend below describes atomic radius.

          Top Chart            Middle Chart            Bottom Chart        None

    12. Which chart above indicates a trend in electronegativity?

          Top Chart            Middle Chart            Bottom Chart           None

    13. Identify which period and group each of the following elements is located:

        7s¹           
        4s²           
        3s²3p⁶        

    14. Which of the following ions has the electron configuration of a noble gas?

            Ca⁺¹    or    Cl^-1

     15. Why is it unlikely for a magnesium atom to form a +1 ion and unlikely for a sodium atom to form a +2 ion? 

    16. While at an amusement park, you inhale helium from a balloon to make your voice higher in  
          pitch. Your friend says that helium reacts with your vocal chords to tighten them up and 
          thus increases the pitch. Why is this an incorrect explanation?

    17. In his periodic chart, Mendeleev placed Be, Mg, Zn, and Cd in one group and Ca, Sr, Ba, and 
          Pb in another group. Examine the electron configurations of each element and explain why
          he would do this.

           Electron Configurations
            Be               Ca   
            Mg               Sr 
            Zn                Ba
            Cd                Pb

    18. Complete the chart below. The first one has been done as an example.

19. Potassium has three isotopes. From the information given below, calculate the average atomic mass of
     potassium.

Average Atomic Mass     

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